MVC购物车系统 上

MVC购物车系统 上

LoginFilter.java 过滤器

package com.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebFilter("/*")
public class LoginFilter implements Filter{

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //有一些页面需要放行 【login.jsp】
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        //拿的是当前项目之后的路径
        String path = req.getServletPath();
        if (path.equals("/login.jsp")||path.equals("/login.do")||"js".equals(path.substring(path.length()-2))||"css".equals(path.substring(path.length()-3))) {
            chain.doFilter(request, response);//放行
            return;
        }
        //判断你是否可以通行【有没有登录：session中是否有user属性】
        Object user = req.getSession().getAttribute("user");
        if (user == null) {
            resp.sendRedirect("login.jsp");
            return;
        } else {
            chain.doFilter(request, response);//放行
        }
    }
	
}

DBHelper.java util包

package com.util;

import oracle.jdbc.driver.OracleDriver;

import java.sql.*;

@SuppressWarnings("all")
public class DBHelper {

    //加载驱动
    static{
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    //定义链接字符串
    private static final String URL="jdbc:oracle:thin:@localhost:1521:orcl";

    //获得链接
    public static Connection getCon() {
        try {
            return DriverManager.getConnection(URL,"scott","123");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    //关闭资源
    public static void close(Connection con,PreparedStatement ps, ResultSet rs) {
        try {
            if (con!=null&&!con.isClosed()) {
                con.close();
            }
            if(ps!=null){
                ps.close();
            }
            if(rs!=null){
                rs.close();
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        System.out.println(DBHelper.getCon());
    }

}

Goods.java pojo包

package com.pojo;

public class Goods {
    private Integer id;
    private String name;
    private String describe;
    private Integer price;
    
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDescribe() {
		return describe;
	}
	public void setDescribe(String describe) {
		this.describe = describe;
	}
	public Integer getPrice() {
		return price;
	}
	public void setPrice(Integer price) {
		this.price = price;
	}
	
    public Goods() {
		// TODO Auto-generated constructor stub
	}
	public Goods(Integer id, String name, String describe, Integer price) {
		super();
		this.id = id;
		this.name = name;
		this.describe = describe;
		this.price = price;
	}
	
	@Override
	public String toString() {
		return "Goods [id=" + id + ", name=" + name + ", describe=" + describe + ", price=" + price + "]";
	}
}

User.java

package com.pojo;

/**
 * @Description 用户实体类
 **/
public class User {

    private Integer id;
    private String account;
    private String password;
    
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getAccount() {
		return account;
	}
	public void setAccount(String account) {
		this.account = account;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public User() {
		// TODO Auto-generated constructor stub
	}
	public User(Integer id, String account, String password) {
		super();
		this.id = id;
		this.account = account;
		this.password = password;
	}
	
	@Override
	public String toString() {
		return "User [id=" + id + ", account=" + account + ", password=" + password + "]";
	}
}

OrderItem.java

package com.pojo;

public class OrderItem {
    private Integer id;
    private Integer orderId;
    private Goods goods;
    private Integer quantity;
    private Integer total;
    
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public Integer getOrderId() {
		return orderId;
	}
	public void setOrderId(Integer orderId) {
		this.orderId = orderId;
	}
	public Goods getGoods() {
		return goods;
	}
	public void setGoods(Goods goods) {
		this.goods = goods;
	}
	public Integer getQuantity() {
		return quantity;
	}
	public void setQuantity(Integer quantity) {
		this.quantity = quantity;
	}
	public Integer getTotal() {
		return total;
	}
	public void setTotal(Integer total) {
		this.total = total;
	}
	
    public OrderItem() {
		// TODO Auto-generated constructor stub
	}
	public OrderItem(Integer id, Integer orderId, Goods goods, Integer quantity, Integer total) {
		super();
		this.id = id;
		this.orderId = orderId;
		this.goods = goods;
		this.quantity = quantity;
		this.total = total;
	}
	
	@Override
	public String toString() {
		return "OrderItem [id=" + id + ", orderId=" + orderId + ", goods=" + goods + ", quantity=" + quantity
				+ ", total=" + total + "]";
	}
}

IGoodsBiz biz包

package com.biz;

import java.util.List;

import com.pojo.Goods;

public interface IGoodsBiz {

    List<Goods> list();

    Goods one(int id);
	
}

IUserBiz

package com.biz;

import com.pojo.User;

public interface IUserBiz {

	User login(User user);
	
}

GoodsBizImpl biz.impl包 (用来实现GoodsBiz接口)

package com.biz.impl;

import java.util.List;

import com.biz.IGoodsBiz;
import com.dao.IGoodsDao;
import com.dao.impl.GoodsDaoImpl;
import com.pojo.Goods;

public class GoodsBizImpl implements IGoodsBiz{

	private IGoodsDao goodsDao=new GoodsDaoImpl();

    @Override
    public List<Goods> list() {
        return goodsDao.list();
    }

    @Override
    public Goods one(int id) {
        return goodsDao.one(id);
    }
	
}

UserBizImpl

package com.biz.impl;

import org.apache.commons.codec.digest.DigestUtils;

import com.biz.IUserBiz;
import com.dao.IUserDao;
import com.dao.impl.UserDaoImpl;
import com.pojo.User;

public class UserBizImpl implements IUserBiz{
	
	private IUserDao userDao=new UserDaoImpl();

	public User login(User user) {
		User use = userDao.login(user);
        if(use==null){
            return null;//account账号在数据库中查询不到记录
        }
        //需要将前端给我的那个用户的密码加密之后再和数据库的密码进行比较
        String pwd= DigestUtils.md5Hex(user.getPassword());
        if(!use.getPassword().equals(pwd)){
            return null;//账号存在,但是密码不一致
        }
        return use;
	}
	
}

IGoodsDao dao包

package com.dao;

import java.util.List;

import com.pojo.Goods;

public interface IGoodsDao {

    List<Goods> list();

    Goods one(int id);
	
}

IUserDao

package com.dao;

import com.pojo.User;

public interface IUserDao {

	User login(User user);
	
}

GoodsDaoImpl dao.impl包

package com.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import com.dao.IGoodsDao;
import com.pojo.Goods;
import com.util.DBHelper;

public class GoodsDaoImpl implements IGoodsDao{

	//定义资源
    private Connection con;
    private PreparedStatement ps;
    private ResultSet rs;

    @Override
    public List<Goods> list() {
        List<Goods> list = new ArrayList<Goods>();
        try {
            con = DBHelper.getCon();
            ps = con.prepareStatement("select * from car_goods");
            rs = ps.executeQuery();
            while (rs.next()) {
                Goods goods = new Goods();
                goods.setId(rs.getInt(1));
                goods.setName(rs.getString(2));
                goods.setDescribe(rs.getString(3));
                goods.setPrice(rs.getInt(4));
                list.add(goods);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBHelper.close(con, ps, rs);
        }
        return list;
    }

    @Override
    public Goods one(int id) {
        List<Goods> list = new ArrayList<Goods>();
        try {
            con = DBHelper.getCon();
            ps = con.prepareStatement("select * from car_goods where id=?");
            ps.setInt(1,id);
            rs = ps.executeQuery();
            if (rs.next()) {
                Goods goods = new Goods();
                goods.setId(rs.getInt(1));
                goods.setName(rs.getString(2));
                goods.setDescribe(rs.getString(3));
                goods.setPrice(rs.getInt(4));
                return goods;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DBHelper.close(con, ps, rs);
        }
        return null;
    }
	
}

UserDaoImpl

package com.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import com.dao.IUserDao;
import com.pojo.User;
import com.util.DBHelper;

public class UserDaoImpl implements IUserDao{

	//定义资源
    private Connection con;
    private PreparedStatement ps;
    private ResultSet rs;

    @Override
    public User login(User user) {
        try {
            con = DBHelper.getCon();
            ps=con.prepareStatement("select * from car_user where account=?");
            ps.setString(1, user.getAccount());
            rs=ps.executeQuery();
            if(rs.next()){
                User use=new User();
                use.setId(rs.getInt(1));
                use.setAccount(rs.getString(2));
                use.setPassword(rs.getString(3));
                return use;
            }
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            DBHelper.close(con,ps,rs);
        }
        return null;
    }
	
}

LoginServlet servlet包

package com.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.biz.IUserBiz;
import com.biz.impl.UserBizImpl;
import com.pojo.OrderItem;
import com.pojo.User;

@WebServlet("/login.do")
public class LoginServlet extends HttpServlet{

    private IUserBiz userBiz=new UserBizImpl();

    //接收用户的数据: 【post】【get】

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        //参数的获取
        String account = req.getParameter("account");
        String password = req.getParameter("password");
        User user = new User();
        user.setAccount(account);
        user.setPassword(password);
        //去biz完成登录验证
        // 表示层(servlet)->业务逻辑层(biz)->数据库访问层(dao)
        User u = userBiz.login(user);
        if(u==null){
            resp.sendRedirect("login.jsp");
        }else{
            //将数据放到session中
            req.getSession().setAttribute("user",u);
            //为这个用户生成一个购物车
            List<OrderItem> car=new ArrayList<>();
            req.getSession().setAttribute("car",car);
            //把总价直接放到session中
            req.getSession().setAttribute("total",0);
            //去到首页
            resp.sendRedirect("index.do");
        }
    }
    
}

indexServlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.biz.IGoodsBiz;
import com.biz.impl.GoodsBizImpl;
import com.pojo.Goods;

@WebServlet("/index.do")
public class IndexServlet extends HttpServlet{

	private IGoodsBiz goodsBiz=new GoodsBizImpl();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //取到biz层中的商品数据的集合
        List<Goods> list = goodsBiz.list();
        //把数据放到index.jsp中去显示
        //request【转发】 session appliction
        req.setAttribute("list",list);
        //只有转发才能携带请求的数据
        req.getRequestDispatcher("index.jsp").forward(req,resp);
    }
	
}

AddServlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.biz.IGoodsBiz;
import com.biz.impl.GoodsBizImpl;
import com.pojo.Goods;
import com.pojo.OrderItem;

@WebServlet("/add.do")
public class AddServlet extends HttpServlet{

	private IGoodsBiz GoodsBiz = new GoodsBizImpl();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //购物车在哪里?
        List<OrderItem> car = (List<OrderItem>) req.getSession().getAttribute("car");
        //是哪件商品?需要用户带一个商品的id
        int id = Integer.parseInt(req.getParameter("id"));
        //购物车中已经有了，数量+1
        boolean f = true;
        for (OrderItem item : car) {
            // item就是订单项,订单项中有一个与他对应的商品
            if (item.getGoods().getId().equals(id)) {
                //数量+1
                item.setQuantity(item.getQuantity() + 1);
                //价格需要重新计算
                item.setTotal(item.getQuantity() * item.getGoods().getPrice());
                f = false;
                break;
            }
        }
        //购物车中没有，添加购物车
        if (f) {
            //生成了订单项
            OrderItem item = new OrderItem();
            //根据商品的id去数据库查出这件商品
            Goods one = GoodsBiz.one(id);
            item.setGoods(one);
            item.setQuantity(1);
            item.setTotal(one.getPrice());
            //添加订单项到购物车
            car.add(item);
        }
        req.getSession().setAttribute("total", car.stream().mapToInt(OrderItem::getTotal).sum());
        //返回首页
        resp.sendRedirect("index.do");
    }
	
}

UpdServlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.pojo.OrderItem;

@WebServlet("/upd.do")
public class UpdServlet extends HttpServlet{

	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //购物车在哪里?
        List<OrderItem> car = (List<OrderItem>)req.getSession().getAttribute("car");
        //是哪件商品?需要用户带一个商品的id
        int id = Integer.parseInt(req.getParameter("id"));
        //获取需要改变的类型(1,-1)
        int type = Integer.parseInt(req.getParameter("type"));
        //购物车中已经有了，数量+1
        for (OrderItem item : car) {
            // item就是订单项,订单项中有一个与他对应的商品
            if(item.getGoods().getId().equals(id)){
                //数量+还是-
                int count = item.getQuantity() + type;
                if(count<1)count=1;//最少一个
                if(count>5)count=5;//最多5个
                item.setQuantity(count);
                //价格需要重新计算
              item.setTotal(item.getQuantity()*item.getGoods().getPrice());
                req.getSession().setAttribute("total",car.stream().mapToInt(OrderItem::getTotal).sum());
                break;
            }
        }
        //返回首页
        resp.sendRedirect("car.jsp");
    }
	
}

DelServlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.pojo.OrderItem;

@WebServlet("/del.do")
public class DelServlet extends HttpServlet{

	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //购物车在哪里?
        List<OrderItem> car = (List<OrderItem>)req.getSession().getAttribute("car");
        //是哪件商品?需要用户带一个商品的id
        int id = Integer.parseInt(req.getParameter("id"));
        //购物车中已经有了,删除
        OrderItem i=null;
        for (OrderItem item : car) {
            // item就是订单项,订单项中有一个与他对应的商品
            if(item.getGoods().getId().equals(id)){
                //你就是我要删除的
                i=item;
                break;
            }
        }
        car.remove(i);
        req.getSession().setAttribute("total",car.stream().mapToInt(OrderItem::getTotal).sum());
        //返回首页
        resp.sendRedirect("car.jsp");
    }
	
}

ClearServlet

package com.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.pojo.OrderItem;

@WebServlet("/clear.do")
public class ClearServlet extends HttpServlet{

	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //购物车在哪里?
        List<OrderItem> car = (List<OrderItem>)req.getSession().getAttribute("car");
        //清空购物车
        car.clear();
        //返回首页
        req.getSession().setAttribute("total",car.stream().mapToInt(OrderItem::getTotal).sum());
        resp.sendRedirect("car.jsp");
    }
	
}

谢谢浏览 点个关注再走吧！！